Method of manufacturing vane-rings for gas or steam turbines.



B. LJUNGSTRUM. METHOD OF MANUFAGTUBING VANE RINGS FOR GAS OR STEAM TURBINES.

Patented ocnzz, 1912.

V l V JTNESSE @fi WM {NVENTOR f7 Attorney UNITED PATENT OFFICE.-

BIRGER LJUNGSTR6M. 0F STOCKHOLM, SWEDEN, ASSIGNOR TO AK'IIEBOLAGEI LJUNGSTROMS ANGTUR'BIN, OF STOCKHOLM, SWEDEN.

Specification of Letters Patent.

Patented Oct. 22,1912.

Application filed February 19, 1.910. Serial No. 544,871.

To all whom it may concern:

Be it known that I, Brenna LJUNGsTRGM, engineer, citizen of Sweden, residing at Grefmagnigatan 18, Stockholm, Sweden, have invented new and. useful Improvements in Methodsof Manufacturing Vane-Rings for Gas or Steam Turbines, of which the following is specification.

My present invention relates to a method of manufacturing vane-rings for gasor .steam turbines, in which the vanes have both of the disk by an annular groove, leaving only a thin annular strip between the outer ring and the disk. By this construction the heat during the soldering or welding process is prevented from being transmitted to the whole disk. This will facilitate soldering or welding, will lessen the amount of heat required and will cause only the peripheral parts of the disk to be heated, thereby preventing stresses and strains in the disks.

In the accompanying drawings: Figure 1 represents a vertical cross-sectional view of the upper half of a vane ring being manu factored according to my; invention, after the first two steps in-my method; Fig. 2, a similar view after the third step; Fig. 3, a similar view after the fourth step, the vane ring now being ready for the fifth step which consists in cutting away the walls f on the lines A-C, C-D; and Fig. 4, a similar view after the first two steps of a repetition of the method on the samedisks, the latter being of smaller diamecr, by reason of the first vane ring having been .cut away, and moved closer together.

. vane-rings.

a designates two disks, which by means of the naves or hubs b or in any other suitable manner are secured to the shaft 0.

(Z are the vanes.

When the rings are to be manufactured grooves g are cut in the outer faces of the disks 0. and near the outer edges thereof, the inner walls of said grooves 1 being perforated to receive the ends of vanes d. The said vanes (Z are inserted in the said perforations and secured therein in any known manner, preferably by soldering or welding. After the vanes have been secured to the disks and have been worked in any desired manner, the peripheral annular part of the disks is cutaway together with the vanes by turning or cutting, for instance by mak ing annular grooves c on lines A-B C-D. \Vhen the securing of the vanes and rings is performed by heatsoldc'ring or welding-the said grooves e are out before the welding or soldering process begins;- thereby, however, a thin strip 1 is left, which is to be cut away, when the soldering or welding process is finished and the whole vane-ring is to be separated from the disks. When the vanes have been inserted in and secured to the rings, the strip f\is cut away, new annular grooves 9 having their vertical walls perforated are cut in the outer faces of the remaining parts of disks a near the outer edges thereof and new vanes cl are inserted in said perforations and the process just described is rcpeated.

It is sometimes necessary to diminish the distance between the disks a when the diameter of the remaining disks is diminished, as the vanesare often shorter in smaller This is provided for by means of the nave 7) consisting of two parts laterally movable in relation to each other. In the said parts the disks a are inserted and by this means the said disks can be moved toward eachother and secured in a new relative position to each other.

It clear that the vane-rings before being separated from the disks can be worked in any desired manner. so that they are completely finished before being cut away from the disks. They may thereby be given the shape indicated in dotted lines on the drawing. whereby they can easily be secured to the ti'irbine-disks or to thicker stiffening rings. f course the disks t be provided with all the grooves beret; they are subjected to further treatment.

I claim:

1. The method of manufacturing vanerings for turbines consistin in inserting: the vanes in a witty securing them to the said body ancl'thereinafter rotting away the part of the body, wherein the vanes had been insertecl, from the other parts of the. ra d body.

2. The method of manufacturing rancrings for turbines consisting in inserting the vanes in a be" cutting a groore in the saitl body, said groove separating the rane-cm'rving part of the body from the other part thereof and only leaving a thin strip between these parts, then securing the vanes to the body by means of heat and cutting away the said thin strip.

3. The method of n'tunufueturing ranerings for turbines consisting in inserting the vanes in a hotly. the ranewarrying part thereof being separated from the other parts by means of a thin strip. then welding the .vancs to the vane-carrying part and cutting away the thin strip.

4. The method of manufacturing vanerlngs for turbines COIlSlbtlng in inserting the rancs'in a disk. securing them to the said disk and thereinafter cutting away the wanecarrying part of the disk.

The method of manufacturing vanerings for turbines consisting in inserting the vanes in a disk, the vnnecarrying part thereof being joined to the other parts by means of a thin strip, Welding the vanes to the vane-carrying part and cutting away the thin strip.

6. The method of manufacturing vanering. for turhincs consisting in inserting the A nds of the vanes in the outer periphery of the (links and leaving only a thin strip between said parts. welding the vanes to the nine-carrying rings and cutting away the strip.

8. The method oi manufacturing. vane rings for turbines consisting in inserting the Qltlir'i of the 3110s in the outer;peripheries of two circular disks. separating the vanecarrying parts of the disks from theother parts thercoi't adjusting the disks in relation to each other, inserting the ends of other vanes in the remaining parts of the disks. welding; the Times to the vane-carrying: rings and separating the vane carrying parts of the disks from the other parts thereof.

In testimony whereof I have signed my ame to this specification 1n the presence of two subscribing witnesses.

BIRGER LJUuesTRoM.

Witnesses H EDWIG Men DER, HARRY AnnILpN. 

